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Effects of Exogenous Calcium Supplementation in Water on Molting Cycle of Macrobrachium rosenbergii |
DU Ting-Ting1, DING Li1, PAN Xi-Fang1, TANG Qiong-Ying1, XIA Zheng-Long2, YANG Guo-Liang1,2, YI Shao-Kui1,* |
1 College of Life Sciences, Huzhou University/Zhejiang Provincial Key Laboratory of Aquatic Resources Conservation and Development, Huzhou 313000, China; 2 Jiangsu Shufeng Prawn Breeding Co., Ltd., Gaoyou 225654, China |
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Abstract Calcium plays an important role in the molting pathway in crustaceans, and it is also an essential element for crustaceans in the biomineralization of the new epidermis in the late ecdystic period. To investigate the effects of exogenous calcium supplementation in water on molting of Macrobrachium rosenbergii, this study conducted the culture experiment with the Ca2+ concentration of 25 (control group), 85, 145 and 205 mg/L in the water. At the end of the culture experiment, the molting rate of the 4 groups was calculated. The content of Ca2+ in the hemolymph was detected, and the effects of exogenous calcium supplementation on calcium absorption and exoskeleton mineralization were investigated using scanning electron microscopy. Meanwhile, the CDS of calmodulin (MrCaM, GenBank No. OQ411017) and calreticulin (MrCRT, GenBank No. OQ411018) in the molting pathway of M. rosenbergii were obtained. The expression levels of MrCaM and MrCRT mRNA in different molting stages of M. rosenbergii were analyzed by qPCR. The results showed that the molting rate of M. rosenbergii was the highest in the 145 mg/L group, and that in 205 mg/L group was significantly lower than that in 25 mg/L group (control group)(P<0.05). In the different molting stages, calcium content in hemolymph of M. rosenbergii firstly increased and then decreased with the increase of water Ca2+ concentration, reaching the peak in the 145 mg/L group. Scanning electron microscope (SEM) results showed that exogenous calcium supplementation could promote the exoskeletal mineralization. The expression levels of MrCaM and MrCRT at different molting stages were the highest in the 145 mg/L group (P<0.05) and significantly lower in 205 mg/L group compared to the 145 mg/L group (P<0.05). The correlation analysis of MrCaM and MrCRT with hemolymph calcium ion content in the different molting stages showed that the expression levels of MrCaM were significantly correlated with hemolymph calcium ion content in molting stage (E stage)(r=0.8854), and the expression level of MrCRT was positively correlated with hemolymph calcium ion content in the different molting stages (P<0.01). Overall, the increase of Ca2+ concentration in water could promote the molting and exoskeleton mineralization of M. rosenbergii. This study provides a basis for clarifying the effects of exogenous calcium supplementation on molting in M. rosenbergii.
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Received: 22 February 2023
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Corresponding Authors:
*02844@zjhu.edu.cn
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